Here is a story interpreting "1x4" as in the context of traditional Nadi (Pulse) Diagnosis .
If you're learning about or practicing a specific technique labeled as "1x4 nadi work," it would be best to refer to the guidance of a qualified teacher or the specific text/context in which it was mentioned for a precise understanding. This concept seems to be quite specialized or perhaps part of a contemporary or evolving practice within yoga or a related field. 1x4 nadi work